A proposed encoder design scheme for turbo-encoded OCDMA-BPPM system

  • Authors:

  • Muralidhar Kulkarni

  • Affiliations:

  • Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India

  • Venue:
  • ICOSSSE'08 Proceedings of the 7th WSEAS international conference on System science and simulation in engineering
  • Year:
  • 2008

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Abstract

An application specific design process has been proposed to implement a Turbo-encoded Optical Code Division Multiple Access system modulated using Binary Pulse Position Modulation (BPPM) for transmission over optical fiber channels. The design process follows a modular approach and consists of four distinct modules RSC encoder, Pseudorandom Interleaver, Parallely to Serial Converter, BPPM circuit. A reference system has been designed for a frame size of 16 bits. Bit error rates were calculated for this reference design, assuming 10 simultaneous users using 5 iterations of the MAP decoding algorithm at various values of SNR for the two obtainable code rates (1/2; 1/3).